javascript
/
three.js
Mirror von https://github.com/tazdij/three.js.git


			
				
					
						
						
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							<!DOCTYPE html>
<html lang="en">
  <head>
    <title>Three.js - postprocessing - 3DLUT w/loader</title>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, user-scalable=no, minimum-scale=1.0, maximum-scale=1.0">
    <style>
    html, body {
      min-height: 100%;
      font-family: monospace;
      background: #222;
      color: white;
    }
    canvas {
      min-width: 512px;
      min-height: 64px;
      image-rendering: pixelated;
    }
    #cube {
      max-width: calc(100% - 20px);
      overflow: auto;
    }
  </style>
  </head>
  <body>
    <h1>Adobe LUT to PNG converter</h1>
    <p>Drag and drop a LUT file here</p>
    <div>size:<input id="size" type="number" value="8" min="2" max="64"/></div>
    <p id="result"></p>
    <p><button type="button">Save...</button></p>
    <div id="cube"><canvas id="c"></canvas></div>
  </body>
<script type="importmap">
{
  "imports": {
    "three": "../../build/three.module.js",
    "three/addons/": "../../examples/jsm/"
  }
}
</script>

<script type="module">
import * as THREE from 'three';
import * as lutParser from './resources/lut-reader.js';
import * as dragAndDrop from './resources/drag-and-drop.js';
import { EffectComposer } from 'three/addons/postprocessing/EffectComposer.js';
import { RenderPass } from 'three/addons/postprocessing/RenderPass.js';
import { ShaderPass } from 'three/addons/postprocessing/ShaderPass.js';

function main() {

	const canvas = document.querySelector( '#c' );
	const renderer = new THREE.WebGLRenderer( { antialias: true, canvas } );

	const makeIdentityLutTexture = function () {

		const identityLUT = new Uint8Array( [
			0, 0, 0, 255, // black
			255, 0, 0, 255, // red
			0, 0, 255, 255, // blue
			255, 0, 255, 255, // magenta
			0, 255, 0, 255, // green
			255, 255, 0, 255, // yellow
			0, 255, 255, 255, // cyan
			255, 255, 255, 255, // white
		] );

		return function ( filter ) {

			const texture = new THREE.DataTexture( identityLUT, 4, 2 );
			texture.minFilter = filter;
			texture.magFilter = filter;
			texture.needsUpdate = true;
			texture.flipY = false;
			return texture;

		};

	}();

	const sceneBG = new THREE.Scene();
	const cameraBG = new THREE.OrthographicCamera( - 1, 1, 1, - 1, - 1, 1 );

	const ctx = document.createElement( 'canvas' ).getContext( '2d' );
	function drawColorCubeImage( ctx, size ) {

		const canvas = ctx.canvas;
		canvas.width = size * size;
		canvas.height = size;

		for ( let zz = 0; zz < size; ++ zz ) {

			for ( let yy = 0; yy < size; ++ yy ) {

				for ( let xx = 0; xx < size; ++ xx ) {

					const r = Math.floor( xx / ( size - 1 ) * 255 );
					const g = Math.floor( yy / ( size - 1 ) * 255 );
					const b = Math.floor( zz / ( size - 1 ) * 255 );
					ctx.fillStyle = `rgb(${r},${g},${b})`;
					ctx.fillRect( zz * size + xx, yy, 1, 1 );

				}

			}

		}

	}

	const idTexture = new THREE.CanvasTexture( ctx.canvas );
	idTexture.magFilter = THREE.NearestFilter;
	idTexture.minFilter = THREE.NearestFilter;

	{

		const planeGeo = new THREE.PlaneGeometry( 2, 2 );
		const planeMat = new THREE.MeshBasicMaterial( {
			map: idTexture,
			depthTest: false,
		} );
		sceneBG.add( new THREE.Mesh( planeGeo, planeMat ) );

	}

	const lutShader = {
		uniforms: {
			tDiffuse: { value: null },
			lutMap: { value: null },
			lutMapSize: { value: 1, },
		},
		vertexShader: `
      varying vec2 vUv;
      void main() {
        vUv = uv;
        gl_Position = projectionMatrix * modelViewMatrix * vec4( position, 1.0 );
      }
    `,
		fragmentShader: `
      #include <common>

      #define FILTER_LUT true

      uniform sampler2D tDiffuse;
      uniform sampler2D lutMap;
      uniform float lutMapSize;

      varying vec2 vUv;

      vec4 sampleAs3DTexture(sampler2D tex, vec3 texCoord, float size) {
        float sliceSize = 1.0 / size;                  // space of 1 slice
        float slicePixelSize = sliceSize / size;       // space of 1 pixel
        float width = size - 1.0;
        float sliceInnerSize = slicePixelSize * width; // space of size pixels
        float zSlice0 = floor( texCoord.z * width);
        float zSlice1 = min( zSlice0 + 1.0, width);
        float xOffset = slicePixelSize * 0.5 + texCoord.x * sliceInnerSize;
        float yRange = (texCoord.y * width + 0.5) / size;
        float s0 = xOffset + (zSlice0 * sliceSize);

        #ifdef FILTER_LUT

          float s1 = xOffset + (zSlice1 * sliceSize);
          vec4 slice0Color = texture2D(tex, vec2(s0, yRange));
          vec4 slice1Color = texture2D(tex, vec2(s1, yRange));
          float zOffset = mod(texCoord.z * width, 1.0);
          return mix(slice0Color, slice1Color, zOffset);

        #else

          return texture2D(tex, vec2( s0, yRange));

        #endif
      }

      void main() {
        vec4 originalColor = texture2D(tDiffuse, vUv);
        gl_FragColor = sampleAs3DTexture(lutMap, originalColor.xyz, lutMapSize);
      }
    `,
	};

	const effectLUT = new ShaderPass( lutShader );

	const renderBG = new RenderPass( sceneBG, cameraBG );

	const rtParameters = {
		minFilter: THREE.NearestFilter,
		magFilter: THREE.NearestFilter
	};
	const composer = new EffectComposer( renderer, new THREE.WebGLRenderTarget( 1, 1, rtParameters ) );

	composer.addPass( renderBG );
	composer.addPass( effectLUT );

	let name = 'identity';
	const lutTexture = makeIdentityLutTexture( THREE.LinearFilter );
	effectLUT.uniforms.lutMap.value = lutTexture;
	effectLUT.uniforms.lutMapSize.value = 2;

	const sizeElem = document.querySelector( '#size' );
	sizeElem.addEventListener( 'change', render );

	function render() {

		const size = parseInt( sizeElem.value );
		renderer.setSize( size * size, size, false );
		composer.setSize( size * size, size );

		drawColorCubeImage( ctx, size );
		idTexture.needsUpdate = true;

		composer.render( 0 );

	}

	render();

	dragAndDrop.setup( { msg: 'Drop LUT File here' } );
	dragAndDrop.onDropFile( readLUTFile );

	function ext( s ) {

		const period = s.lastIndexOf( '.' );
		return s.slice( period + 1 );

	}

	function readLUTFile( file ) {

		const reader = new FileReader();
		reader.onload = ( e ) => {

			const type = ext( file.name );
			const lut = lutParser.lutTo2D3Drgba8( lutParser.parse( e.target.result, type ) );

			effectLUT.uniforms.lutMapSize.value = lut.size;

			lutTexture.image.data = lut.data;
			lutTexture.image.width = lut.size * lut.size;
			lutTexture.image.height = lut.size;
			lutTexture.needsUpdate = true;

			render();
			name = `${file.name || lut.name || 'untitled'}`;
			document.querySelector( '#result' ).textContent = `loaded: ${name}`;

		};

		reader.readAsText( file );

	}

	const saveData = ( function () {

		const a = document.createElement( 'a' );
		document.body.appendChild( a );
		a.style.display = 'none';
		return function saveData( blob, fileName ) {

			const url = window.URL.createObjectURL( blob );
			a.href = url;
			a.download = fileName;
			a.click();

		};

	}() );

	document.querySelector( 'button' ).addEventListener( 'click', () => {

		render();
		renderer.domElement.toBlob( ( blob ) => {

			saveData( blob, `${name}-s${renderer.domElement.height}.png` );

		} );

	} );

}

main();
</script>
</html>